<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        img{
            display: block;
            margin: 198px auto;
        }
        form{
           margin-top: -195px;
        }
        input{
            display: block;
            margin: 0px auto;
            width: 670px;
            height: 30px;
        }
    </style>
</head>
<body>
   <div class="main">
       <img src="guge.png">
       <form>
          <label for="">
              <input type="text"  placeholder="在Googe上搜索或输入网址">   <!--placeholder在搜索框上显示文字-->
          </label>
       </form>
   </div>
</body>
</html>